Pre-Requisites and Checklist for D4W Marketing Module
Before your practice can start sending marketing emails through the D4W Marketing Module, there are two things to check.
1. Check Your Practice Email Address
2. Authorise our system to send emails for you.
Check Your Practice Email Address
The D4W Marketing Module sends emails on behalf of your practice.
To do this, your practice needs an email address that is linked to your own website domain (e.g. “yourpractice.com.au”).
What does that mean?
Think of your email address — specifically the part after the “@” symbol.
| Email Type |
✔️ | Your email ends with your practice’s own domain — for example: reception@yourpractice.com.au |
❌ | Your email is a free service such as: @gmail.com — @yahoo.com — @outlook.com — @hotmail.com |
Why can’t I use Gmail or Outlook?
Email providers like Gmail, Yahoo, and Outlook have rules that block bulk marketing emails from being sent through their systems.
Because of these restrictions, our marketing service (powered by SMTP2Go) is unable to send emails using free email addresses.
This is an industry-wide policy and cannot be overridden.
What Should I do if we only have a Gmail Address?
Please speak with the person who manages your practice IT or website. You will need to:
- Register a domain name for your practice (e.g. yourpractice.com.au), if you do not already have one.
- Create a professional email address using that domain (e.g. reception@yourpractice.com.au).
Once you have a domain-based email address, come back to complete the rest of this checklist.
Where can I register a domain?
You can register a domain name at companies like:
If you are unsure which to choose, ask your IT person for a recommendation.
Authorise Our System to Send Emails For You (CNAME Setup)
Once you have confirmed that your email address uses your own domain, there is one more technical step.
Your IT person or website host needs to add a special entry to your domains settings called a CNAME record.
What is a CNAME record and why do I need it?
Simple explanation: A CNAME record is like a permission slip that tells email systems: “This practice has authorised SMTP2Go to send emails on their behalf.”
Without this permission, emails sent through the D4W Marketing Module will not be delivered.
Without the CNAME record, emails will NOT be sent!
If the CNAME record is not in place, the D4W Marketing Module will not be able to deliver any emails to your patients.
This is the most common reason why the service stops working.
Alternative option — Safe Sender setting
If your IT person is unable to add the CNAME record, there is a secondary option.
Please ask your Centaur support contact about the “Safe Sender Email” setting. This is a workaround that may allow emails to be sent in some cases.

Example: CNAME records as shown in a domain management system
For full technical details, your IT person can also refer to the SMTP2Go documentation:
Quick Summary Checklist
Please confirm both of the following before contacting us to complete your setup:
My practice email uses our own domain (not Gmail, Yahoo, or Outlook)
Example: reception@mypractice.com.au
Our IT person has added the CNAME records to our domain
Or we have arranged the Safe Sender alternative with Centaur support
We are happy to walk you through what is needed or liaise with your IT provider.
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